Asked by: Nena Dapena
home and garden home improvement

Can you put epoxy primer over self etching primer?

Last Updated: 6th August, 2021

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Re: Can epoxy primer be sprayed over self-etching primer (without ill effects)? It's fine to spray epoxy over self etching. But self etching is mainly to slow down rust before you lay down your filler or other high build primers.

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Similarly, you may ask, what is the difference between epoxy primer and etch primer?

Epoxy primer is catalyzed and self etching is solvent based. Self etching primer bonds well to bare metal surfaces and can be top coated in a short period of time. Epoxy primer can be applied in heavy coats which can be guide coated and block sanded to remove small imperfections in the body.

Likewise, do you need self etching primer on bare metal? Use self-etching primer on bare metal. It will work on just about any metal, whether steel, diecast alloys, or others. The caveat with this type is that you need to remove the old paint and treat the rust ahead of time. If you need to use any fillers like Bondo, apply the fillers before you apply your primer.

Moreover, can you paint directly over self etching primer?

Self-etching primers have to have another primer over the top of them or the paint won't adhere. It can't be an epoxy primer, but it can be a urethane primer. In the meantime, it's important to talk to your paint dealer about the time window allowed between the primer and paint topcoat.

What is the purpose of self etching primer?

About Self-Etching Primer Rust-Oleum® Self Etching Primer prepares bare metal, aluminum and fiberglass surfaces to promote maximum adhesion and smoothness of the top coat. This product is formulated to stop rust and is an essential step to achieve a professionally finished look.

Related Question Answers

Dannielle Gruszczynsk

Professional

What is the best primer for bare metal?

Simply put, epoxy is the best primer for bare metal, making it excellent for newly fabricated metal parts or ones that have been fully stripped.

Yudelka Franci

Professional

Do you need to sand self etching primer?

However, most manufacturers of self-etching primer, due to the acid base of the products, don't recommend directly sanding the self-etching primer. It should be noted that self-etching primer is mainly an acid base with pigments added, so you should be wearing a respirator when applying it.

Etna Beckenhaub

Explainer

How long can you leave etch primer before painting?

All Etch Primers need to be left for a minimum of 24 hours at a temperature of 18 - 20 degrees Celsius to dry properly. Whilst this is the minimum it is advisable to allow significantly longer before applying topcoats.

Mikki Frago

Explainer

Should I sand self etching primer before painting?

For best adhesion, apply 2 or 3 thin coats and allow each coat to dry for 2 minutes before applying the next coat. Allow the final coat of Self Etching Primer to dry for a minimum of 3-4 hours before dry sanding, or 15 minutes before wet sanding with #400 grit sandpaper. Do not use near open flame.

Abdenbi Balreira

Explainer

Will Self etching primer stop rust?

After you remove the rust scales from the metal on your car, you need to apply self etching primer. It's a mix of phosphoric acid and zinc. It's purely a surface coating, and it doesn't stop the rust. It does, however, prevent the rust problem from worsening.

Vasilev Bakrymoff

Pundit

Does epoxy stop rust?

Less time sensitive but more expensive. So even with very light surface rust, the epoxy wont prevent further corrosion? Rust needs water and oxygen. The epoxy will seal these things out, but rust in pits is porous and will contain some water and some oxygen.

Yanitza Capellino

Pundit

Can you spray epoxy primer over old paint?

You can coat epoxy or urethane primers over old paint. I personally would not, but you can. It won't craze the paint like spraying laquer on old enamel. But you would really be better off just sanding it down to the factory primer, at least.

Hassam Rydl

Pundit

What is the best self etching primer for aluminum?

Rust-Oleum Automotive Self Etching Primer promotes maximum adhesion and smoothness of the top coat on bare metal, aluminum and fiberglass surfaces. Etches and primes in 1 easy step. Rust preventive for a long-lasting finish.

Kabir Honerbom

Pundit

Can you big over etch primer?

no, I don't advise using self etch over body filler or old paint- not even over primer/surfacer- the acid in the self etch primer, lifts and softens body filler and primer/surfacer and old paint.

Emmanuelle Ladra

Teacher

How do you prep bare metal for primer?

To properly prepare new metal surfaces, use mineral spirits to remove grease and apply a rust-inhibitive primer before painting. For painted surfaces that are in sound condition, remove dust with a clean, dry cloth, de-gloss the surface with light sanding, and wipe with mineral spirits to ensure good adhesion.

Amaro Puertolas

Teacher

Do you have to prime over etch primer?

You can't paint directly over etch primer. You need a surfacer or other primer/sealer over it.

Xenia Matea

Teacher

Is rustoleum a primer?

Rust-Oleum Professional Primer Spray provides twice the protection of enamels alone. The primer provides excellent coverage and is tough enough for commercial applications. The primer prepares the project with a durable coating and superior protection from rust.